diff --git a/vendor/gems/discourse_plugin/Gemfile b/vendor/gems/discourse_plugin/Gemfile
index 4bfb4319a..2710a4a63 100644
--- a/vendor/gems/discourse_plugin/Gemfile
+++ b/vendor/gems/discourse_plugin/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 group :test do
-  gem 'rails'  
+  gem 'rails'  , '>= 5.0.0'
   gem 'rspec'  
   gem 'mocha'
 end